325287 The recommended concentration of fluoride ion in drinking water is up to \(1 \mathrm{ppm}\) as fluoride ion is required to make teeth enamel harder by converting \(\left[3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} . \mathrm{Ca}(\mathrm{OH})_{2}\right]\) to :
325287 The recommended concentration of fluoride ion in drinking water is up to \(1 \mathrm{ppm}\) as fluoride ion is required to make teeth enamel harder by converting \(\left[3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} . \mathrm{Ca}(\mathrm{OH})_{2}\right]\) to :
325287 The recommended concentration of fluoride ion in drinking water is up to \(1 \mathrm{ppm}\) as fluoride ion is required to make teeth enamel harder by converting \(\left[3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} . \mathrm{Ca}(\mathrm{OH})_{2}\right]\) to :